Furnace-stoker.



PATBNTED DBG. 3, 1907. E. E. sL PURN IIIIIIIIIIIIIIIIIIIIIIIIII 6.

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mvEN'roR PATENTED DEG. 3, 1907.

E. E. SLIGK.

PURNACE STOKER.

APPLIOATION FILI-:D rms. 12. 190e.

4 SHEETS-SHEET 2.

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PATENTED DEG. 3, 190'7.

E. E. SLICK. FURNAGE STOKER.

APPLIOATION FILED FEB. 12, 190e.

4 SHEETS-SHEET 3.

m i En'ron WITNESSES PATENTED DEC. 3, 190'7.

E. E. SLICK. 4 FURNA'GE STOKER. APPLIoATIoN PILED'FBB. 12. 1906.

4 SHEETS-SHEET 4.

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' Specification of Letters Patent.

Patented Dec. 8, 1907.

Application led February 12. 1906. Serial No. 300.595.

To'all whom 'it may concern:

Be it known that I, EDwiN E. SLICK, 'of Pittsburg, Allegheny county, Pennsylvania, have invented a new and useful Furnace- Stoker, of which the following is a full, clear, and exact description, reference being had to the accompanying drawin s, forming part of this specific-ation, in whic Figure 1 is a partial longitudinal vertical section of a metal heating furnace provided with my improved Stoker; Fig. 2 is a top plan view of the same, one half in horizontal section; Fig. 3 is a front elevation; Fig. 4 is a view similar to Fig. 1, showing modified form; and Figs. 5. and 6 are detail views s howing the'preferred arrangement of the pusher devices.

MyA invention relates to the class of furnace stokers by which fuel is automatically fed to a furnace.

The object of the invention is to provide a simple and effective apparatus for this purpose which will give economy of fuel, is not able to get out of order and is long lived.

. A further object is to provide for varying the heat at different points in the width of the Stoker, `and also to vary the feed at different parts of the width in order to give the desired heating action in the different portions of the grate.

In the drawings, referrin to the form of Figs. 1 2, 3, 5 and 6, in which show my inven- -tion as applied to the fiat roof heating furnace of my Patent No. 810,228, dated January 16, 1906, 2 represents the furnace chamber, 3 the flat roof, and 4 the coal fired furnace at the end opposite to the feed-in end for the billets or metal. This furnace chamber is prefere I ably of greater height than width and 1n this form is provided with a transverse shelf or grate surface, the upper portion 5 of which 1s preferably imperforate while the lower portion is formed of slotted plates which are removably held in a series of box-shaped castings 7. The castings 7 are of a width equal to a fraction of the width of the furnace chamber, and into which leads a branch pipe 8 from an air blast main 9. The castings 7 may be supported in any suitable manner as upon the cross-rails 10, 10, and they extend downwardly in front of the front wall 11 of the furnace chamber. A series of cross shelves' 12 is thus provided having a series of `integral cast bracket supports 13. A series of pushers 14 4are provided between the Shelves 12 and theparallel flange 15' at the pee lated by dampers in the pipes 8 controlled by lower end of the transverse hopper 16. These pushers are preferably cored out as shown 1n Fig. 2, so that each is provided with two arms 17 which are removably secured .to a

transverse angle bar 18 by a screw-threaded adjusting rod 19 having clamping nuts 20. By means of this adjustable bolt and clamping nuts, the point of forward movement of one pusher may be adjusted relative to the others so as to change the amount of feed at various portions of the cross-section.

The angle bar may be reciprocated by any suitable connections, and I have shown end links 21 connected to bell cranks 22 mounted on stub shafts and connected by eccentric rods 23 to eccentrics 24. on a driven shaft 25 extending across the top of the furnace. The bell cranks are thus oscillated at any desirable speed giving a reciprocatory movement to the series of pushers.

Water seal. 27 is an overflow pipe which maintains the water at this level, 28 being the feed-in pipe for the water.

The combustion chamber is preferably provided with doors 29 in the opposite side walls of the chamber, each door preferably having a peep hole 30, the door being hung on side hinges or any other desirable manner. The fire may thus be sliced from the sides, and may be inspected through the holes.

e blast into each blast box may be reguhandles 31.

In the operation of the stoker, the coal or other fuel is supplied to the hopper- 16` throughout the width of the same, and is ushed down the inclined shelf 'or grate surace by the series of reci rocating pushers. The lower end of the fue bed rests against l the ash bed which builds up to the lower end of the shelf or grate, and the ashes `and refuse are raked out from time to time through the water seal opening. If itis desired to vary the heat at any portion of the cross section of the furnace, this may be done by varying the draft through the blast boxfat this portion and also by adjusting the stroke of the pusher at this portion. In this manner the eat may be made substantiall uniform throughout the cross section of t e heatmg furnace, or if desired the heat may be varled,

so that the metal will be heated to a greaterl 2. .In a stoker, a transverse shelf extendextent in one portion than in another portion of its length., p j

In the modification of Fig'. 4, the shelf 5 is imperforate and extends horizontally; In this case the ash bed referably extends to about the level b, b an the bed of coals rests u on the ash bed, and is fed with air through t e slots 32 in the front walls of the boxes. Inwardly-extending anges 33, are preferably used in order to give the air blasts a downward inclination as they'enter' the bed of fuel. In this case the pushers 14 reciprocate horizontally in a plane parallel with the shelf or bed 5. In this figure parts similar to those ofthe other figures are marked with similar numerals with the prime mark applied. l

The advantages of my invention will be apparent to those skilled in the art. The ash and clinkers are easily removed from time to time by raking out through the water seal. The blast may be varied in different portions of the width as may also the amount of feed. The heat is thus regulable as dee sired.

The apparatus is simple and not liable to get out of order and moving grate parts are avoided.

The grate castings may be easily changed as they are worn out, and the pushers are not subjected to high heat, being protected by the fuel lying in front of them.

The stoker may be applied to furnaces of any character, andmany other variations may be made without departing from my invention.

I claim 1. A stoker having a transverse shelf ex tending forwardly into a combustion chamber and terminating short of the wall opposite said shelf -to form a fuel bed space beyond the shelf, and a series of independently adjustable pushers arranged to move on the entire width of said shelf and feed the fuel forwardly across .the shelf and combustion chamber, and ada ted to vary the amount of feed for the fue across the width of said chamber; substantially as described.

ing forwardly irto a combustion chamber and terminating short of the wall opposite the shelf to form a fuelbedspace eyond said shelf, and a series of reciprocating pushers arranged to feed the fuel at all points in the width of the shelf, said pushers being mounted on said shelf s'o as to be independently adjustable to vary the amount of feed for the fuel at different points in the width of the shelf; substantially as described.

3. l In a stoker, a combustion chamber,- a transverse shelf in front of said chamber, a series of pushers arranged to force fuel forwardly on said shelf, a series of blast boxes `beneath the shelf, means for varying the length of the stroke of the pushers with re spect to each other, and means for varying the blast supply through each blast box; substantially as described.

4. In a stoker, a transverse shelf extending forwardly into a combustion' chamber, a water-sealed ash-pit for said chamber, a series of pushers arranged to push fuel forwardly on said shelf, means for varying the stroke of at leasta part of said pushers with respect to each other, a seriesof blast boxes beneath said shelf, and means for varying the blast supply through each blast box, substantially as described. I

5. A Stoker having a transverse shelf extending forwardly into'a combustion cham ber and terminating short ofthe wall opposite the shelf to form a fuel bed space beyond said shelf, an ash-pit below the fuel bed space arranged to accumulate the ashes and support the fuel bed on the ashes, a series of pushers arranged to force fuel forwardly on the shelf, means for varying the length of the stroke iof the pushers with respect to each other and adapted to vary the amount of feed for the fuel across the width of the fuel Y- bed space; substantially as described.

In testimony whereof I have hereunto set my hand.

- EDWIN E. SLICK.

Witnesses:

' Guo. B. BLEMrN,

j JOHN MILLER. 

